This book introduces graph theory to students who are not mathematics majors. The primary use of this book is for furthering mathematical reasoning through the subject of graph theory. Concepts are introduced through relatable real-world examples modeled mathematically. The book is written with no proofs, but rather explanations so students understand where the results come from. Each chapter attempts to answer three main questions--existence (does a solution exist?), construction (how do we find a solution?), and optimization (how do we find the best answer or dind one quickly?). Ample...